Alarm.



No. 813.164. PATENTED FEB. 20, 1906. W. L. MONROE. ALARM.

APPLICATION FILED MAY 25, 190%.

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j. 111ml" WILLIAM LEA LDAS MONROE, OF OMAHA, NEBRASKA.

ALARM.

ivo. 813,164.

Specification of Letters Patent.

Patented Feb. 20, 1906.

Application filed May 25, 1904. SeriaLNo. 209,710.

T0 @ZZ whom t may concern:

Be it known, that I, WILLIAM LnALDAs MONROE, a citizen of the UnitedStates, and a resident of Omaha, in the county of Douglas and State ofNebraska, have invented a new and Improved Alarm, of which the followingis a full, clear, and exact description.

My invention relates to alarms, and more particularly to thoseapplicable to doors and windows for use as burglar-alarms. Its principalobject is to provide an effective and inexpensive device of thischaracter.

It consists in the various features and combinations hereinafterdescribed and claimed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a perspective view of one embodiment of my invention. Fig. 2is a front elevation thereof with the trigger in its locking position.Fig. 3 is a rear elevation. Fig. 4 is a front elevation with the hammerreleased. Fig. 5 shows the device arranged for coaction with a door.Fig. 6 is a central horizontal longitudinal section. Fig. 7 illustratesthe application of the device to a window. Fig. 8 is a detail inperspective, showing the manner of securing the post to the base. Fig. 9is a detail view of part of a window-casing, showing the inclinedposition of the'actuating member of the device.

10 designates a base, which may conveniently consist of an elongatedplate of sheet metal, at the opposite sides of which are flanges 11 11,furnishing an intermediate space or chamber. At one end of this base ismounted a holder or barrel 12, which is preferably formed by bendingover into a cylinder a tongue furnished by a portion of the width of theplate. This holder may be of such dimensions as to receive a blankcartridge, the detonation of which furnishes the alarm. At the end ofthe holder is a shield 14, which may consist of a tongue formedsimilarly to that which provides the holder, but of less length, itbeing bent into a frustoconical contour converging from the end of theholder and serving to direct the discharge from the cartridge away fromthe surface on which the device is supported. At the opposite end of thebase near one edge a lug 15 furnishes a retaining projection, thepurpose of which will be hereinafter described.

Between the ends of the base is mounted a post 16, which is preferablyin the form of a hollow cylinder extending through an opening 17 andhaving slots 18, which engage tongues 19, projecting inward fromopposite sides of the opening. These tongues prevent the rotation andinward movement of the post, and it is retained in place against outwardmovement by upsetting its extremity at 20. Pivoted about the post is anloperating member or hammer 21, conveniently formed of sheet metal andof such length that it may engage the retaining projection 15 at one endof the plate or may ooact at the other end with a cartridge O in theholder, this latter coacting portion being preferably reduced at 22 toenable it to more certainly explode the fulminate. Encircling the postoutside the hammer is a spring 24, one end of which. is secured to saidpost at its outer end by forcing down over it a tongue 25, while theopposite end extends along the hammer and beneath a tongue or lug 26,turned up from the plate.

Mounted to slide at the rear of the base between the plate-fianges is areleasing member or trigger 27. This may be mounted in guides formed bypairs of projections 28 28, struck up from the plate. The trigger isshown as having at its inner end an enlargement or head 29, which by itscontact with the inner guide prevents longitudinal withdrawal. Betweenthe guides the plate 'is preferably cut away at 30, and the trigger hasa reduced or narrowed portion 31, which may move therethrough when thetrigger is in the position illustrated in Fig. 4 of the drawings. At theouter end of the trigger is an angular portion 32, serving as afinger-piece, and from this is an inturned lug 33, which may projectover the hammer when it is in coaction with the retaining projection andlock it against release.

In use in connection with a door the base is secured upon the casingindicated at C by means of screws applied through openings 34 in thebase in such position that when the trigger is drawn out to its fullextent it will project slightly into the path of the door D. The holderis now provided with a cartridge, and the hammer is turned under theretaining projection, being held under tension by its spring. Now itwill be seen that if the door is opened it will contact with the end ofthe trigger, and this member will be moved Outward through the cut-awayportion 3() of the plate and press the hammer from beneath IIO it,sounding an alarm.

the projection, whereupon the spring will throw it forcibly to the otherside of the base into contact with the cartridge and explode In applyingmy improved alarm to -a window the base may be similarly secured to thetop rail of the lower sash S and in the casing C2 an actuating member Mplaced, which is here shown as a screweye, situated at a distance fromthe sash, which will secure the sounding of the alarm at the desiredamount of opening of the window and lying in an outwardly-inclinedplane. This results in the trigger being pressed from the base as itrides over the incline, which effects the release of the hammer, as hasjust been described. In this connection or with the door when it is notdesired that the alarm shall be set for action the trigger is pressed toits extreme inmost position, at which the 'finger-piece contacts withthe end of the hammer. In this position the lug on said fingerpieceextends over the hammer and locks it beneath the retaining projection,obviating the possibility of accidental release and the necessity ofmanipulating the hammer except when alarm has acted. This permits thecartridge to be left in the holder at all times, but it can only beexploded when the alarm is set.

It will be seen that, although this devicel furnishes an effective alarmin which the hammer is operated by ample force under comparativelyslight pressure by the door or window which is to actuate it, it may bevery inexpensively manufactured, the base, holder, shield, and theguiding and retaining projections being stamped from a single sheet ofmetal, while the other elements are equally simple to produce. It willbe obvious that the holder may be varied in diameter to receivecartridges of any suitable caliber or that the holder may support anyother device which by the contact of the hammer will sound an alarm.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination wi th a base, of a holder, anoperating member mounted upon the base, a retaining projection on thebase for the said operating member, and a releasing member carried bythe base and having a projection which may extend over the operatingmember, to lock the same in an inoperative position.

2. The combination with a base, of a post extending therefrom betweenits ends, a hammer movable about the post, a holder and retainingprojection situated at opposite ends of the base, and a releasing memberfor the hammer movably mounted adjacent to the retaining projection.

3. The combination with a base provided with an opening, of a tongueextending into the opening, a post situated in the opening and having aslot engaging the tongue, and a hammer movable about the post.

4. An alarm comprising a plate having flanges, a holder, a hammerpivoted upon the plate, guides situated between the flanges, and amember for coaction with the hammer mounted in the guides and having anenlargement which may contact with one of said guides.

5. An alarm comprising a plate having an opening, a holder carried bythe plate, a hammer pivoted upon said plate, and a member mounted toslide upon the plate and being movable through the opening into coactionwith thel hammer.

6. An alarm comprising a plate, a holder carried by the plate, a hammerpivoted to said plate, and a member mounted to slide upon the oppositeside of the plate Jfrom the hammer and'having a projection which 4maycontact with the outer face ofthe hammer.

7. An alarm comprising a plate having an opening, a holder carried bythe plate, a hammer pivoted upon said plate, and a member mounted toslide upon the opposite side of the plate from the hammer and beingmovable through the opening intoA coaction with said hammer, this memberhaving a projection which may contact with the outer face of the hammer.

8. The combinationwith a base having an opening at one end, of a holder,an operating member pivotally mounted upon the base, a retainingprojection on the base for said operating member, and a releasing membermounted to slide upon the base andmovable through the opening in thebase to engage and release the operating member.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM LEALDAS MONROE.

Witnesses:

M. E. PATCH, F. M. JoNEs.

